Features • Delta-sigma modulator. • Two stereo input selector. • "Click and pop" suppression circuitry. • Micropower shutdown mode. • 24 lead TSSOP package (No heatsink required). • Stereo headphone amplifier. Description The LM4663 is a fully integrated single supply, high efficiency Class D audio power amplifier solution. The LM4663 utilizes a continuous time delta-sigma modulation technique that lowers output noise and THD when compared to conventional pulse width modulators. The LM4663 also features a stereo headphone amplifier that delivers 80mW into a 32 headset with less than 0.5% THD. The LM4663 has two stereo inputs that can be selected to drive either the headphone amplifier or the Class D amplifier. All amplifiers are protected with thermal shutdown. In standby mode, the LM4663 draws an extremely low 2µA supply current. With a 4 load, the IC's efficiency for a 250mW power level is 69%, reaching 83% at a power level of 2W. The IC features click and pop reduction circuitry that minimizes audible popping during device turn-on and turn-off. The LM4663 is available in a 24-lead TSSOP package, ideal for portable and desktop computer applications. Key Specification PO at THD+N = 1% 2.1W (typ) THD+N at 1kHz at 1 Watt into 4 (Power Amp) 0.2% (typ) Efficiency at 2 Watt into 4 83% (typ) Efficiency at 250mW into 4 69% (typ) Total quiescent power supply current 22mA (typ) Total shutdown power supply current 2µA (typ) THD+N 1kHz, 20mW, 32 (Headphone) 0.15% (typ) Single supply range 4.5V to 5.5V Applications • Portable computers • Desktop computers • Multimedia Monitors

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Typical Application *click for larger image	Block Diagram *click for larger image

Datasheet

Title		Size	Date	Other Language
	LM4663 Boomer ® Audio Power Amplifier Series 2 Watt Stereo Class D Audio Power Amplifier with Stereo Headphone Amplifier	1007 Kbytes	13-Apr-06	日本語

Featured Application Notes

Title		Size	Date	Other Language
	AN-1651: Application Note 1651 Keeping Up with the Expanding Demands of High-Performance Audio	206 Kbytes	10-Jul-07	中文
	AN-1671: Application Note 1671 Gain and Linearity Testing for Precision Operational Amplifiers	417 Kbytes	21-May-08	日本語
	AN-1784: Application Note 1784 LMV1022 / LMV1023 Digital Output PDM Microphone Amplifier Demo Board User's Guide	3786 Kbytes	6-Mar-08

More Application Notes

Title		Size	Date	Other Language
	AN-1784: Application Note 1784 LMV1022 / LMV1023 Digital Output PDM Microphone Amplifier Demo Board User's Guide	3786 Kbytes	6-Mar-08
	AN-1671: Application Note 1671 Gain and Linearity Testing for Precision Operational Amplifiers	417 Kbytes	21-May-08	日本語
	AN-1651: Application Note 1651 Keeping Up with the Expanding Demands of High-Performance Audio	206 Kbytes	10-Jul-07	中文

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Standard Pack Size
LM4663MT/NOPB RoHS	TSSOP	Lifetime buy Lead Time: 6 weeks	Distributor Region Qty AVNET-EM Worldwide 244 DIGIKEY Worldwide 0	$1.52 each at 1K+ pcs	rail of 61

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM4663MT	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM4663MT	CMOS7	0	18406	0	0	1089000	4	309006723

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

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Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM4663MT	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009